Gas mixer



G. S. BARROWS.

GAS MIXER.

APPLICATION FILED NOV. 5 1920.

Patentd Dc. 5, 1922.

ifatenteri IQEZ.

ai n.2, na y lt'elllltlll i @WM5 enormen s. nanaow'sjorraovrnnncn, nironn Istant, Assienon ro GENERAL Finn nXirrne-Uisrinn courants', `or raovrnnnon, RHODE ISLAND, a oonronn'rron or New Yoan. H

AppncsuunmeaNovember5,1920.? "serial 421,876. i

To @ZZ whom .it may concern.' n f Be it known that LGEORGE S. l3Annows,a citizen of the United States, `residing at State of Rhodel lsland, haveinvented certain new` and useful lmprovenents 1n `Gas Mixers,

of which the following is a specication;

This invention relates'to improvements yin l gas mixers.

The industrial'uses of a gasfflame, which are many and important, frequently require that a variation be made either inthe body of the flame or in the constituent proportion of the gases. For economyof fuel and economy of workmens time it has been appre-r ciated that it would be highly useful to have apparatus by which the workman lcould eX- tinguish the flame; or reduce it as desired,l with a rapid motion', and restore it'again with equal speed, without havingto burden himself with the relighting or with the delicacy of adjustment ofproportions of gases upon yrestoring the flame; also to be able to reduce the total heat without `reducing'the temperature of the flame, an ill result which- .ordinarily follows ifwhe ymerelylturns down the gas without reducing the supply of air, assuming that air is the: oxidizing agent in use. lt is another desirable-i'eaturel to have apparatus -in which the physical mixtureor distribution of vrgases through the flameiis uniform, producing a flame which is uniform in all regions as regards temperature and` perfection of combustion at all speedsof ini flow. v

The present invention has for its object the making of'apparatusfwhich shall'have the above advantageous features, and those others which characterize the apparatus hereinafter set forth, among'which are the ability to beset so as to produceany of.` a considerable range of diiferent proportions of mixture, and to maintain the chosen proportions with approximate accuracy, whatever Adegree of .f fullness of llame is desired.y These objects yare accomplished by-providing a pair of valves f similarly located, one in the supply pipe of;

-- rmedialsection; and

each gas, with a lever or swing. arm to operate each, and a master lever whoseswing vcon-y Y ure 2 showing the details ofthe adjustable trols bothso that kthey swing in unison.; and

tional movements ofithe other valve. lathe 4*specific form illustrated the operating arm lfor one ofthe valves, constitutes a lever actuating linkage' to the other valve.v4 The said Providence, inthe' county ofProividenee and i VImmediately after` passing the valves` they pipes are arranged parallel to eachother.

connect with a mixing shell, through the midst of whichy is a passage forming a continuation of one of the pipes, and around the periphery of which, `surrounding the said passage',, is another passage forming a continuation of the otherpipe. Thesepassages in the shell are separatedby a conical wall through which are holes at intervals,:drilled on axesoblique to thea-Xie of the central passage. Assuming that air, which ordinarily Awould beimpelled under pressure, is connected yto flow throughthe central passage, and combustible gas under pressure through the peripheral passage, it follows. that upon'the movement of the master lever thetwo valves Kopen 1n a pre-determined relationk to .each

other, and that gas beginstoycircle karound the air and to flowinto the air 'current from all sides of it through said holes.` If ythe shell pressure be low, ybecause of the lvalves being opened only to a small degree, the mixture will nevertheless be approximately uniform with that whichv occurs at higher pressure i because the iiowing of the airg through the central passage Lhas`so1newhat of an ejector effect, so as to drawfin theygas evenfrom those parts of the peripheral passage which 'are remote from theplace where' gas enters that passage. f i j.

l It' is intended that the patent shall cover, by ,suitable expression inthe appended `claims,.whatever features of patentablenoveltyexist inthe invention disclosed. v

f ln the accompanying drawings, which repj `resent one embodiment of the invention;

Figure l is a planshowing the valves with linka-ge in closed` position;

Figure 2 is a. right end elevation, of the same, showing also the screw-stopmeans for limiting the` closing of the valves;

' Figure 3 is aleft end elevation; f Figure 4, is aplan of the mixer shell in `an air control valve' 1 2 having gate 13; and A combustible gas ordinarily under slight pressure is supplied through a similar but preferably smaller pipe 14 to a gas control valve 16 having gate 17. These valves, which may be of any suitable type,` are here illustrated as being swinging gate valves ot' a Well known style in which an internal arm that swings the gate is connected through gearing within to a short shaft passing out through the valve casing and having outside a swing arm by which the shaft and gate are moved to open or close the valve. In the application of the invention herein illustrated, the inner details or' the gate valves are not shown but` are to be understood as being located Within the bodj7 casing 18 of the air valve and 2O of the gas valve, access to which may easily be had by unscrewing bolts 22 and 24 and removing covers 26 and 28 respectively. Gn the squared end 30 of the shaft projecting through the packing nut 32 of the air valve, is pinned the operating arm 34 ot that valve which serves also as a lever by which the other valve may be simultaneously moved. rlhis arm is pro vided with a longitudinal slot 36 in Which a block 38 may be moved, and iixed at various positions. A similar block 40 is similarly adjustable in a `slot 42 which extends longitudinally in a link 44 Whose other end is pivoted to the endet a swing arm 46, which is pinned on the 'squared end 48 oi an operating shatt which extends `in through the packing nut oi the gas valve. he adjustable blocks 3S and 40 are clamped securelj,T in their respective lslots by suitable means, which prevent their sliding in the slots but permit their rotation with respect to each other.

In Figure 5 is shown one form ot' suchv means in which the blocks 38 and 40 are separate sleeves mounted next to 'each other on a single pin 54 which passes through the slots 36 and 42 Where those slots cross. This sleeve 38 has a head portion which is too large to enter the slot 36, a neck portion `which fits slidablyfin the slot and which is not quite equal to the 'lever 34 inthickness, and a stud 55 projecting on the other side of that lever, threaded and carrying a Washer 56 and a nut 58. The lever 'can thus be clamped between the `nut and said head portion of the sleeve, yet is free Vto turn with respect to the pivot pin, because the sleeve isfree to 'turn thereon. The other sleeve block 40 is likewise secured tast to the arm 44, and yetis free to turn about the pivot pin 54. These 'blocks'are assembled on th'epivo't pin vv'ith their heads together, preferably With a little lubricant between them, and 'are held thus 1by `cotter pins or 'other means ateach end of the pivoty On loosening 'its -`claimping 'nut feither block may .be separately positioned in its resistente-slet to vary 'the .relative .act-:len

ot the levers and hence of the vales; but the pivotal connecting pin 54 maintains the blocks in axial rotatable relation to each other. W'hen the blocks are so fastened, a swing of the arm 34 produces a corresponding movement of the arm 46, the handle 34 constituting a lever for that purpose With the shaft 30 acting as ulcrum, though the degree of 4movement-'ot the arm 46 may bek quite dilferent from that of the arm 34 depending upon the position of the blocks in the slots of the handle and connecting link. Setting'the block 38 out or in along slot 36 in the arm 34 Will produce more or less motion of arm' 46' When the swing occurs, thatr is, more or less coincident'change kof setting of valve 16. Setting the block 40 nearer to or farther i'rom the arm along link 44, will change the degree to Which one valve stands open When the other is at any given degree of opening, that is, change the zero point. Handle 34 thus operates both valves simultaneously.y Because ot this adjustability a Wide range of relative valve openings may be had. A stop screw 60, passing through the swing arm 46, may be adjusted to strike the casing of the valve 16' thereby limiting the closure. This has utility Where it is desired to prevent the `llame from being extenguished, leaving itf'.

burning low and ready instantly in larger volume upon the opposite swinging of the lever. Then once he has adjusted this screw Vor'this purpose,"the Workman can loperate .jf-,he handle rapidly in either direction, vvith` out particular care and lWithout fear oi" entirely shutting off the llame.

A mixer shell 62, connected closely to the air valve 12 by a short nipple 64, has a central cylindrical passage through which Jghe air passes direct to a mixing chamber 65. Surrounding this central passage is an annular chamber 66 formed by the passage wall and the exterior wall of the shell, into .which the gas from valve 16 is conducted by an elboW-68. This annular chamber 66 is separated from the mixing chamber by a conical partition 70 through which holes 'l2 are drilled obliquely to the axis oil' the central passage, andft'hiough which the gas len- 'tersthe mixing chamber and joins the air. T he induction of to the current of' air in separated jets on all sides ot the air makes `a mixture which is approximately uniform, because 'of that separation and distribution of jets from the very instant ot gas first meeting theair. Hencethe mixing chamber 65 lcan be 'very short, and its exit 74, which 'is of 'greater diameter lthan the 'central passafge 'through the shell so as to accommodate the combined vohunes Iot the ycomponents 'ot the mixed gas,` may be connected to a burner 7 6 of 'any 'desired type. The mixing "is facilitated 'however 'by the fact that at .the

pla-ce where' the gasesfare if'nrst; mnglem-"by jets of one passing through said holes into c v that the air whichhas entered chamber 65 CIK is expanding along the cone and is the more readily penetrated by the liets of the combustible gas, which enter perpendicularly to the body of air at that point, yet pointing for*- ward. i

The operation of the mixer is exceedingly simple. A slight throw of the handle 34 turns on or orf, or increases ordecreases, thek supply of both gases; and the apparatus maintains the proportion of one gas to the other approximately constant as predetermined from time to time, by the setting of thelinkage. i

ln manufacture it is an advantage that the mixing chamber is so sherl-I tor the holes 72 can in consequence be drilled by a tool inserted through the discharge endt.

l claim as my invention:

l. A gas mixer having a shell with central passage, and an annular passage around it, beyond which the central passage has a mix-k ing and delivery portion adapted to lead to a burner; the whole being arranged withr a wall between said central passage and the annular passage, near an open end of the passage, oblique to the axis of the central passage, and provided with a multiplicityk of holes formed on axes normal to said oblique wall, and pointing substantially in radial planes toward said axis, located in different directions from said axis and at distances from the said open end ot the passage such that the said axes of' holes pass out through the open end, through which openings the gas is jetted from the annular passage into the central passage.

2. A gas mixer comprising a shellwith central passage and an annular passage around the central passage, having a series of openings thereinto distributed therearound; the central passage beyond said openings being adapted to lead the gases to a burner while being mixed in said passage beyond; inlets of the shell, leading respectively to the said annular and central passages, arranged with their axes parallel. and adapted tor pipeconnections, whereby the shell holds rigidly the Pipes so connected; and a pair of valves at .said entrances, set on i said parallel axes, having swinging arms,

connecting linkage and a single operating arm, whereby they move simultaneously and proportionately. f f

A gas mixer having a shell with combination oic three tubular passages; comprising two inlet passages for separate gases and a single outlet passage for the mixture thereof; valves at" the said inlets; and unitary means controlling them whereby they move simultaneously and proportionately to vary the said inlet passages thereby kmaintaining lthe mixture insaid shell in predetermined proportions. n ,K

4. A, gas mixer comprising a shell with a central inlet passage; an annular inlet passage therearound, having a series of openings into the central'passage, beyond which the said central passagey becomes ya common outlet; valves, one controlling each inlet passage of' the shell; and unitary means vtor moving said valves simultaneously and proing'prolongedibeyond the point of connection, thereby constituting alever for operating the other arm; there being a lug on one arm adapted to engage 'a fixed part and thereby to stop the closing swing of the system before the valves are closed.

6. A gas mixer comprising, in combina* tion, a mixing chamber, separate gas passages leading thereto, each having a valve with-swinging arm; and alink connecting the said arms, there being crossed slots provided in the link and in one of said arms, andscrewk clamping sleeves, arranged on a common pivot pin about which they may separately rotate, eachy passing through one of the slots and adapted to clamp the link or arm in which its slot is.-

lvided in ythe link and in one of said arms,

and screw clamps, one passing througheaoh slot, having a common axis about which onev clamp may rotate relativeto vthe other while both are intheir several slots.v y

Signed at Providence, Rhode island, this twenty-seventh day of October, 1920.

Geenen s. Bxnnows. 

